Image to Base64 Converter Free
Convert any image to a Base64 encoded string free online — copy as a Data URI, HTML img tag, CSS background or raw string. No sign-up, no upload to any server, instant in your browser.
🔢 Drag & drop an image here
or click to browse
JPG · PNG · WebP · GIF · SVG · HEIC supported · No sign-up required
100% Private — No Upload
Your image is read and encoded entirely in your browser using the FileReader API. Nothing is ever uploaded to any server at any point.
4 Output Formats
Get your encoded image as a Data URI, raw Base64 string, CSS background-image value, or a ready-to-paste HTML img tag — one click to switch.
One-Click Copy
Copy the full encoded string to your clipboard with one click — ready to paste straight into your HTML, CSS or JavaScript file instantly.
What is Base64 and When Should You Use It?
Base64 is an encoding scheme that converts binary data — like image files — into a string of ASCII text characters. When applied to images, it produces a long string starting with data:image/png;base64,iVBORw0K... that can be embedded directly in HTML, CSS or JavaScript without requiring a separate file request from the browser.
The main use case is reducing HTTP requests for small images — icons, logos, background textures or inline SVGs — by embedding them directly in your stylesheet or HTML. This can improve page load performance for small assets, though it increases file size by approximately 33% so it is not recommended for large images. It is also commonly used in JSON APIs that need to transport image data as text, and in email HTML where external image links are often blocked. To encode PNG to Base64 free online, just upload your PNG — the Data URI string is ready to copy instantly with no sign-up.
After converting, you may also want to compress your image first to reduce the Base64 string size, or convert to WebP which produces significantly smaller Base64 strings than JPG or PNG. For viewing metadata about your image, use our metadata viewer.
How to Use Your Base64 String
Once you have your Base64 encoded string, here are the four ways to use it depending on your context. Switch between formats above the output box and copy the right one for your use case.
HTML img tag
Embed directly in an HTML file — no external file needed, no HTTP request.
<img src="data:image/png;base64,iVBO..." alt="Image">CSS background-image
Use as a background in your stylesheet — embed images in CSS free online.
.icon { background-image: url('data:image/png;base64,iVBO...'); }JavaScript / JSON
Store or pass image data as a string in code or API responses.
const img = "data:image/png;base64,iVBO...";Email HTML
Embed images in email templates where external image links are blocked.
<img src="data:image/png;base64,iVBO...">Frequently Asked Questions
How do I convert an image to Base64 free online?
Upload any image using the drop zone above — JPG, PNG, WebP, GIF, SVG or HEIC. The Base64 encoded string is generated instantly in your browser with no sign-up and no upload to any server. Choose your output format (Data URI, raw Base64, CSS or HTML) and click Copy to Clipboard.
How do I embed an image in CSS using Base64?
Upload your image, then click the "CSS background" tab in the format selector. The output will show the complete CSS property ready to paste: background-image: url('data:image/png;base64,...'); — copy it and paste directly into your stylesheet. Works for all modern browsers.
Why is my Base64 string so long?
Base64 encoding increases file size by approximately 33% because it represents binary data using only 64 printable characters. A 100KB image produces a Base64 string of roughly 133KB. This is why Base64 is best for small images like icons and logos. Use our image compressor first to minimise the string length before encoding.
Which image formats can I convert to Base64?
Any image format your browser can read — including JPG, PNG, WebP, GIF, SVG, BMP and HEIC from iPhone. The MIME type is preserved in the data URI automatically (e.g. data:image/png, data:image/webp) so the browser knows how to decode it. Use our image converter to change the format before encoding if needed.
Is Base64 the same as encryption?
No — Base64 is an encoding scheme, not encryption. It is entirely reversible without a key. Anyone who has the Base64 string can decode it back to the original image instantly. Do not use Base64 to protect sensitive images — it provides no security whatsoever.
Should I use Base64 for all images on my website?
Only for small images under about 5–10KB. Base64 increases file size by 33% and cannot be cached separately by the browser. For large images, external files with proper caching headers are always faster. For small icons and logos that appear on every page, Base64 in CSS can reduce HTTP requests and improve performance.
What other free image tools does FreeConverto offer?
FreeConverto offers a full suite including an image converter, image compressor, image resizer, image cropper, rotate & flip, image filters, colour picker, watermark tool, metadata viewer, PNG to ICO, image to PDF and meme generator.